Hey mate, considering your height and weight, along with your desire for a legal and race-ready ride, both the Tillotson T4 and the Margay 206 are solid choices to consider. Both brands have a good reputation in the karting community, so you can’t really go wrong with either.
However, given your specific measurements and the desire for a comfortable fit, the Margay 206 might be a better option for you. Margay karts are known for their versatility and adjustability, this should provide you with more flexibility in finding a comfortable driving position that accommodates your height and inseam.
While you’re exploring your options for a new kart chassis, I wanted to share an insightful resource with you. At Kartclass, we have an article that delves into the world of the most popular chassis brands. This article is a valuable read for karting enthusiasts like yourself who are seeking in-depth knowledge about various chassis options if you wish to get into TAG or KA Racing down the track.